#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

int n, s;
int a[N];

int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> n >> s;
  rep(i, 1, n) {
    int d, a;
    cin >> d >> a;
    int l = d == 1 ? 1600 : 1200;
    int r = d == 1 ? 2799 : 2399;
    if (s >= l && s <= r) s += a;
  }
  cout << s;
  return 0;
}